Filming for Port of Call began in Hong Kong on 1 September 2014[9] and wrapped up on 26 September.[10][3] In order to prepare for his role as a grizzled veteran police detective, Aaron Kwok grew a moustache and beard, which, along with his hair, were dyed grey in colour, and also had to reduce his gym exercise routines.[9]
Release
Port of Call premiered as the closing film at the 39th Hong Kong International Film Festival on 6 April 2015 where the 120 minute director's cut version of the film was shown.[4] The film was later theatrically released in Hong Kong on 3 December 2015 with two versions of the film being shown; the 120 minute director's cut version which was rated Category III, along with a 98 minute IIB-rated version.[11]